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One user moaned on Reddit: "This really pisses me off. Apple has known about this ever since beta 4 or 5 and have done nothing about it. This is a big bug and lots of people use exchange servers."

Apple on Tuesday rolled out iOS 11.0.1 and said in a support document that the update will fix the issue.

"If your email account is hosted by Microsoft on Outlook.com or Office 365, or an Exchange Server 2016 running on Windows Server 2016, you might see this error message when you try to send an email with iOS 11: 'Cannot Send Mail. The message was rejected by the server,'" Apple said. "To fix the issue, update to iOS 11.0.1 or later."

Wandera monitored a "subset of 50,000 moderate to heavy iPhone and iPad users" on its networks running iOS 11 and iOS 10, and found that battery life for those who have upgraded is decaying over twice as fast as those running iOS 10. µ